Regular Article

Dynamic recombination of triplet exciton with trapped counterion in conjugated polymers

¹ College of Information Science and Engineering, Hebei North University, Zhangjiakou 075000, P.R. China
² Department of Electronics, Polytech Nice Sophia, Nice 06200, France
³ Department of Physics, Xingtai University, Xingtai 054001, P.R. China

^a e-mail: zjkwangyadong@sina.com
^b e-mail: my882154@126.com

Received: 20 June 2020
Received in final form: 21 July 2020
Accepted: 28 July 2020
Published online: 7 September 2020

Abstract

The dynamic recombination of an on-chain triplet exciton with an off-chain counterion trapped in an impurity molecule has been investigated using a molecular dynamics method. It has been found that luminous composite states including the trion and the singlet exciton are the main products in the triplet exciton-counterion reaction and their yields depend sensitively on the impurity potential and the coupling between the polymer chain and the impurity molecule. We demonstrate that the triplet exciton-counterion reaction can enhance the electroluminescence efficiency considerably, and that the triplet exciton plays an important role in the photoelectric process of polymer. Our results provide a new clue to understand the electroluminescence mechanism in the polymer light-emitting devices.